That doesn't help. The file that they give you is the updated launcher, and Steam wants to use the older version. Placing the file that they give you into your Steam files isn't going to help because Steam sees it as a corrupt file. If you verify the cache, Steam replaces the new launcher that you put in with the old one that it wants to use. If you run the game after verification, the launcher automatically updates itself to the new version that Steam, for some reason, doesn't like. It's a never-ending cycle in which the game and Steam undo each other's actions.

In a nutshell, The problem seems to be that there is incompatibility between the launcher that the game itself wants to use, and the launcher that Steam wants to use.

P.S. It would sure be nice if we could at least get SOME help from a Steam employee or a forum mod.